Triple-rhodium quantum effects in the HMQC spectra of [Rh₆(CO)₁₅L] [L = MeCN, I, PBuⁿ₃, P(OPh)₃, P(4-XC₆H₄)₃; X = H, OMe, F] modulate the intensity and position of the correlations in the rhodium dimension; cross peaks are displaced from the true chemical shift, additional cross peaks are seen, and the intensity of the coherences varies as a function of the mixing time and coupling constant, going to zero at the conventional value of 1/(2J).